Yeah, he didn't have much interest in participating in political events or marches...usually avoided doing so. Nevertheless, his songs did do much to help motivate people in the civil rights movement and the antiwar movement, so they proved quite useful at the time. His value was as a writer, not as a direct participant...(and it has been said "the pen is mightier than the sword".)(at times, not always)

He did show up on one notable occasion, though. He and Joan Baez sang at the March on Washington the same day when Martin Luther King gave his famous "I have a dream" speech. I think Peter, Paul, and Mary were also there and sang that day.